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• W3144039449 abstract "Bulk polycrystalline samples of La0.60Sr0.4MnO3 and La0.60Sr0.25-yNa0.15ΔyMnO3 with 0.00≤ y ≤0.15 (Δ representing cation vacancy) were successfully synthesized using the sol-gel method. The structural, magnetic, and electrical properties of the polycrystallineof the samples were investigated. The results of X-ray powder diffraction patterns show that these compounds crystallize in a distorted rhombohedral structure with the space group R(3)C . The measurement shows that, with vacancy content y increasing, the unit cell volume V of samples increases, furthermore, the Curie temperature TC decreases. The temperature dependence of resistivity shows that all samples undergo a metal-semiconductor transition accompanying a ferromagnetic to paramagnetic transition with the increase of temperature. Under an applied filed of 1.8 T, a maximum room temperature magnetoresistance ( MR ) of 20% is obtained at 293 K for the compound La0.60Sr0.1Na0.15Δ0.15MnO3. The MR peak value of La0.60Sr0.1Na0.15Δ0.15MnO3 increases2 times more than that of La0.60Sr0.40MnO3 ( MRP=6.4%, TMR =373 K), and the MR peak is shifted from 373 K to room temperature." @default.
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• W3144039449 date "2006-01-01" @default.
• W3144039449 modified "2023-09-28" @default.
• W3144039449 title "Enhanced room temperature magnetoresistance in maganites La0.60Sr0.25-yNa0.15Δy MnO 31" @default.
• W3144039449 hasPublicationYear "2006" @default.
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